Widnes coach Denis Betts says it is hard for his players to gain momentum, because of a lack of league fixtures.
They have another free weekend this week after Sunday's 22-18 win over York, a third Championship win in four.
He told BBC Radio Merseyside: "When you [normally] play week-in week-out, it's hard to keep any momentum when you keep having breaks in that.
"It's baffling really. When I was a player you thought you played too many games - now we're not playing enough."
Widnes are still sixth in the Championship following their tight encounter with the Knights on Sunday and Betts says the team from Yorkshire did not let themselves down.
"I was impressed with a few of their lads and they've real good contact in defence," Betts continued. "They've got some real good aggression in them.
"It's just a tough thing to do; come up from the division below and then be competitive in this league.
"If they stay in this division, they can be competitive next year."